GPT 5.6 Luna vs Grok 4.20
OpenAI's fastest, most affordable GPT-5.6 tier for high-volume, latency-sensitive work.
xAI's newest flagship model with industry-leading speed and agentic tool calling.
No captured outputs for these models yet.
Frequently Asked Questions: GPT 5.6 Luna vs Grok 4.20▼
Which is better, GPT 5.6 Luna or Grok 4.20?
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Both GPT 5.6 Luna and Grok 4.20 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.
Which is cheaper, GPT 5.6 Luna or Grok 4.20?
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Grok 4.20 has a lower blended cost. GPT 5.6 Luna: $1.00 input / $6.00 output. Grok 4.20: $1.25 input / $2.50 output.
Which has a larger context window, GPT 5.6 Luna or Grok 4.20?
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Grok 4.20 has a larger context window: GPT 5.6 Luna supports 1.1M tokens vs Grok 4.20 at 2M tokens.
Do both GPT 5.6 Luna and Grok 4.20 support vision?
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Yes, both GPT 5.6 Luna and Grok 4.20 support vision/image input.
What are the key differences between GPT 5.6 Luna and Grok 4.20?
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GPT 5.6 Luna and Grok 4.20 have similar overall capabilities. The main differences lie in pricing, context window size, and provider-specific strengths. Use this comparison page to review all metrics side by side.
Which model should I choose for my use case?
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If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 5.6 Luna and Grok 4.20 for free on idapt.app to see which performs better for your specific needs.